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md/raid5: Allow recovered part of partially recovered devices to be in-sync

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During a recovery of reshape the early part of some devices might be
in-sync while the later parts are not.
We we know we are looking at an early part it is good to treat that
part as in-sync for stripe calculations.

This is particularly important for a reshape which suffers device
failure.  Treating the data as in-sync can mean the difference between
data-safety and data-loss.

Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
NeilBrown 2010-06-17 17:25:21 +10:00
parent 674806d62f
commit 415e72d034
1 changed files with 30 additions and 12 deletions
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42
drivers/md/raid5.c
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@ -3031,7 +3031,6 @@ static void handle_stripe5(struct stripe_head *sh)
mdk_rdev_t *rdev;
dev = &sh->dev[i];
clear_bit(R5_Insync, &dev->flags);
pr_debug("check %d: state 0x%lx toread %p read %p write %p "
"written %p\n", i, dev->flags, dev->toread, dev->read,
@ -3068,17 +3067,27 @@ static void handle_stripe5(struct stripe_head *sh)
blocked_rdev = rdev;
atomic_inc(&rdev->nr_pending);
}
if (!rdev || !test_bit(In_sync, &rdev->flags)) {
clear_bit(R5_Insync, &dev->flags);
if (!rdev)
/* Not in-sync */;
else if (test_bit(In_sync, &rdev->flags))
set_bit(R5_Insync, &dev->flags);
else {
/* could be in-sync depending on recovery/reshape status */
if (sh->sector + STRIPE_SECTORS <= rdev->recovery_offset)
set_bit(R5_Insync, &dev->flags);
}
if (!test_bit(R5_Insync, &dev->flags)) {
/* The ReadError flag will just be confusing now */
clear_bit(R5_ReadError, &dev->flags);
clear_bit(R5_ReWrite, &dev->flags);
}
if (!rdev || !test_bit(In_sync, &rdev->flags)
|| test_bit(R5_ReadError, &dev->flags)) {
if (test_bit(R5_ReadError, &dev->flags))
clear_bit(R5_Insync, &dev->flags);
if (!test_bit(R5_Insync, &dev->flags)) {
s.failed++;
s.failed_num = i;
} else
set_bit(R5_Insync, &dev->flags);
}
}
rcu_read_unlock();
@ -3312,7 +3321,6 @@ static void handle_stripe6(struct stripe_head *sh)
for (i=disks; i--; ) {
mdk_rdev_t *rdev;
dev = &sh->dev[i];
clear_bit(R5_Insync, &dev->flags);
pr_debug("check %d: state 0x%lx read %p write %p written %p\n",
i, dev->flags, dev->toread, dev->towrite, dev->written);
@ -3350,18 +3358,28 @@ static void handle_stripe6(struct stripe_head *sh)
blocked_rdev = rdev;
atomic_inc(&rdev->nr_pending);
}
if (!rdev || !test_bit(In_sync, &rdev->flags)) {
clear_bit(R5_Insync, &dev->flags);
if (!rdev)
/* Not in-sync */;
else if (test_bit(In_sync, &rdev->flags))
set_bit(R5_Insync, &dev->flags);
else {
/* in sync if before recovery_offset */
if (sh->sector + STRIPE_SECTORS <= rdev->recovery_offset)
set_bit(R5_Insync, &dev->flags);
}
if (!test_bit(R5_Insync, &dev->flags)) {
/* The ReadError flag will just be confusing now */
clear_bit(R5_ReadError, &dev->flags);
clear_bit(R5_ReWrite, &dev->flags);
}
if (!rdev || !test_bit(In_sync, &rdev->flags)
|| test_bit(R5_ReadError, &dev->flags)) {
if (test_bit(R5_ReadError, &dev->flags))
clear_bit(R5_Insync, &dev->flags);
if (!test_bit(R5_Insync, &dev->flags)) {
if (s.failed < 2)
r6s.failed_num[s.failed] = i;
s.failed++;
} else
set_bit(R5_Insync, &dev->flags);
}
}
rcu_read_unlock();